Step by step on how to book a taxi service at Geneva Airport ?
From personal experience I do recommend Swiss Taxi Transfert . It is a highly trustful taxi company with a good ratio quality/price. Here are the steps on how to book a transfer trip with them:
by phone call on +41 78 308 88 84
using their easy to fill online form booking
contact them via email on firstname.lastname@example.org
from Quora website: https://fr.quora.com/Step-by-step-on-how-to-book-a-taxi-service-at-Geneva-Airport?__filter__=all&__nsrc__=1&__sncid__=4714390098&__snid3__=7612478278